CN108490592A - Varifocal optical system - Google Patents
Varifocal optical system Download PDFInfo
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- CN108490592A CN108490592A CN201810153566.6A CN201810153566A CN108490592A CN 108490592 A CN108490592 A CN 108490592A CN 201810153566 A CN201810153566 A CN 201810153566A CN 108490592 A CN108490592 A CN 108490592A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145105—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+--
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
- G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Varifocal optical system is provided.The varifocal optical system is small-sized, and includes by from the sequence of object side along optical axis：First lens group (G1) with positive refractive power, the second lens group (G2) with negative refractive power, the third lens group (G3) with positive refractive power, the 4th lens group (G4) with negative refractive power and the 5th lens group (G5) with negative refractive power, when zooming to telescopic end state from wide-angle side state, change the distance between the first lens group (G1) and the second lens group (G2) respectively, the distance between second lens group (G2) and the third lens group (G3), the distance between the third lens group (G3) and the 4th lens group (G4) and the distance between the 4th lens group (G4) and the 5th lens group (G5), thus high zoom ratios and high optical property are provided.
Description
Division is stated
The application be the applying date be on 2 27th, 2013, entitled " varifocal optical system, Optical devices and manufacture
The method of varifocal optical system ", application No. is：201380011477.3 Chinese invention patent application divisional application.
Technical field
The present invention relates to the varifocal optical system of the interchangeable lenses, digital camera, video camera that are suitable for camera etc.,
The method of Optical devices and manufacture varifocal optical system.
Background technology
The various varifocal optical systems of interchangeable lenses for single lens reflex camera etc. have been proposed, wherein most
Object side lens group has positive refractive power.For example, with reference to Japanese patent application, No.2002-365547 is disclosed.
Existing technical literature
Patent document
Patent document 1：Japanese patent application discloses No.2002-365547
Invention content
Technical problems to be solved
However, there are traditional varifocal optical system if it is desired to the small-sized and high zoom ratios of acquisition, then be very difficult to obtain foot
The problem of reaching high optical property.
In view of the above problems, it is made that the present invention, and the object of the present invention is to provide with high zoom ratios and catch light
Learn mini-focal optical system, Optical devices and the method for manufacturing varifocal optical system of performance.
Solve the problems, such as this means
According to the present invention, a kind of varifocal optical system is provided, includes by from the sequence of object side along optical axis：With positive dioptric
First lens group of power；The second lens group with negative refractive power；The third lens group with positive refractive power；With negative refractive power
The 4th lens group, and the 5th lens group with negative refractive power；
When zooming to telescopic end state from wide-angle side state, between first lens group and second lens group
The distance between distance, second lens group and described the third lens group, the third lens group and the 4th lens group
The distance between and the distance between the 4th lens group and the 5th lens group change respectively.
In addition, according to the present invention, the Optical devices with the varifocal optical system are provided.
In addition, according to the present invention, the method for providing manufacture varifocal optical system includes the following steps, is pressed from object along optical axis
The sequence on side, setting：First lens group with positive refractive power；The second lens group with negative refractive power；With positive dioptric
The third lens group of power；The 4th lens group with negative refractive power, and the 5th lens group with negative refractive power；And
It is configured so that when zooming to telescopic end state from wide-angle side state, changes first lens group and institute respectively
State the distance between the distance between second lens group, second lens group and described the third lens group, the third lens
The distance between group and the 4th lens group and the distance between the 4th lens group and the 5th lens group.
Advantageous effect
According to the present invention, provide with high zoom ratios and the mini-focal optical system of high optical property, Optical devices
With the method for manufacture varifocal optical system.
Description of the drawings
Fig. 1 shows the wide-angle side state of the varifocal optical system of the first example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.
Fig. 2A and 2B is to show when focusing infinity, according to the wide-angle side state of the varifocal optical system of first example and
The figure of the various aberrations of first middle focal length state.
Fig. 3 A and 3B are to show when focusing infinity, according to the second middle focal length of the varifocal optical system of first example
The figure of the various aberrations of state and telescopic end state.
Fig. 4 shows the wide-angle side state of the varifocal optical system of the second example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.
Fig. 5 A and 5B are to show when focusing infinity, according to the wide-angle side state of the varifocal optical system of second example and
The figure of the various aberrations of first middle focal length state.
Fig. 6 A and 6B are to show when focusing infinity, according to the second middle focal length of the varifocal optical system of second example
The figure of the various aberrations of state and telescopic end state.
Fig. 7 shows the wide-angle side state of the varifocal optical system of the third example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.
Fig. 8 A and 8B are to show when focusing infinity, according to the wide-angle side state of the varifocal optical system of third example and
The figure of the various aberrations of first middle focal length state.
Fig. 9 A and 9B are to show when focusing infinity, according to the second middle focal length of the varifocal optical system of third example
The figure of the various aberrations of state and telescopic end state.
Figure 10 is the view of the construction for the camera for being shown provided with the varifocal optical system of with good grounds the application.
Figure 11 is the flow chart for schematically showing manufacture according to the method for the varifocal optical system of the application.
Specific implementation mode
Hereinafter, illustrate varifocal optical system, Optical devices and the method for manufacturing varifocal optical system of the application.
The varifocal optical system of the application includes by from the sequence of object side along optical axis：First lens with positive refractive power
Group, the second lens group with negative refractive power, the third lens group with positive refractive power, the 4th lens group with negative refractive power
With the 5th lens group with negative refractive power, and
When focusing on telescopic end state from wide-angle side state, change first lens group and second lens respectively
The distance between the distance between group, second lens group and described the third lens group, the third lens group and described the
The distance between four lens groups and the distance between the 4th lens group and the 5th lens group.
By above-mentioned construction, so that the varifocal optical system of the application is realized zoom and can inhibit to be caused by zoom
Distortion variation.
In addition, the varifocal optical system of the application has the 5th lens group as negative lens group as described above, thus
The principal point of varifocal optical system can be arranged in object side and in the entire zoom from wide-angle side state to telescopic end state
In range, the overall length (entire length) of varifocal optical system is reduced.In addition, the distance from optical axis to edge light beam can be made
It is small, therefore, the diameter of the 5th lens group can be made small.It is assumed that the 5th lens group is positive lens groups, if varifocal optical system is complete
Length is identical as the diameter of the 5th lens group, compared with the 5th lens group is the situation of negative lens group, the refractive power of each lens group
By bigger.Therefore, under this hypothesis situation, when zooming to telescopic end state from wide-angle side state, it is difficult to inhibit sphere mapping
The variation of the variation and astigmatism of difference.
Due to the above reasons, according to the present invention it is possible to realize the mini-focal with high zoom ratios and high optical property
Optical system.
Preferably, the varifocal optical system of the application meets following conditionals (1)：
1.80<(-f5)/fw (1)
Wherein, f5 indicates the focal length of the 5th lens group, and fw is indicated in wide-angle side state, the coke of varifocal optical system
Away from.
Conditional (1) defines the range of the pinpointed focus of the 5th lens group and when ensuring zoom ratio, and inhibition is drawn by zoom
The condition of the variation of the aberration risen.By meeting conditional (1), the varifocal optical system of the application can inhibit caused by zoom
Distortion variation and astigmatism variation, and can realize high optical property.
If the value of (- f5)/fw of the conditional (1) of the application is equal to or is brought down below lower limit, the 5th lens group
Focal length becomes too small.For this purpose, the distortion variation caused by zoom and astigmatism variation can not possibly be inhibited by becoming the 5th lens group, by
This, cannot obtain high optical property.
It may be mentioned that in order to ensure obtaining the effect of the application, preferably the lower limiting value of conditional (1) is set to
2.40。
The upper limit value of conditional (1) is more preferably set to 10.0.If the conditional of the varifocal optical system of the application
(1) value of (- f5)/fw is equal to or is brought down below the upper limit value of conditional (1), then the 5th lens group can inhibit by zoom
Caused distortion variation and astigmatism variation, can obtain high optical property as a result,.It may be mentioned that in order to more ensure to obtain this
The upper limit value of conditional (1) is preferably set to 8.50 by the effect of application.
Moreover it is preferred that the varifocal optical system of the application meets following conditionals (2)：
0.40<f5/f4<4.20 (2)
Wherein, f4 indicates the focal length of the 4th lens group, and f5 indicates the focal length of the 5th lens group.
Conditional (2) defines the best ratio of the focal length of the 5th lens group and the focal length of the 4th lens group, and is for pressing down
Make the condition of the variation of the aberration caused by zoom.By meeting conditional (2), the change to distort caused by zoom can be inhibited
Change the variation with astigmatism, thus, it is possible to obtain high optical property.
If the value of the f5/f4 of the conditional (2) of the varifocal optical system of the application is equal to or is brought down below conditional (2)
Lower limiting value, then the focal length relative to the 4th lens group, the focal length of the 5th lens group become too small.For this purpose, becoming to press down
System distortion variation caused by zoom and astigmatism variation so that high optical property cannot be obtained.
It may be mentioned that in order to more ensure the effect of acquisition the application, preferably the lower limiting value of conditional (2) is set
To 0.52.In addition in order to more ensure the effect of acquisition the application, the lower limiting value of conditional (2) is more preferably set to 0.66.
On the other hand, if the value of the f5/f4 of the conditional (2) of the varifocal optical system of the application equals or exceeds condition
The upper limit value of formula (2), then the focal length of the 4th lens group become fairly small.This causes it is not possible that inhibition was generated in the 4th lens group
The variation of astigmatism so that can not achieve high optical property.
It may be mentioned that in order to more ensure the effect of acquisition the application, preferably the upper limit value of conditional (2) is set
To 2.80.In addition, more to ensure the effect of acquisition the application, the upper limit value of conditional (2) is more preferably set to 1.60.
Furthermore it is preferred that the varifocal optical system of the application meets following conditionals (3)：
0.88<(-f5)/f3<8.20 (3)
Wherein, f3 indicates the focal length of the third lens group, and f5 indicates the focal length of the 5th lens group.
Conditional (3) defines the best ratio between the focal length and the focal length of the third lens group of the 5th lens group, and is suppression
Make the condition of the variation of the aberration caused by zoom.By meeting conditional (3), can inhibit the distortion caused by zoom, as
It dissipates, each variation of spherical aberration and coma, thus, it is possible to obtain high optical property.
If the value (- f5/f3) of the conditional (3) of the varifocal optical system of the application is equal to or is brought down below conditional
(3) lower limiting value, then the focal length of the 5th lens group become too small relative to the focal length of the third lens group.For this purpose, become cannot
The variation for inhibiting the variation and astigmatism that distort caused by zoom, it is thus impossible to obtain high optical property.
It may be mentioned that more to ensure the effect of acquisition the application, preferably the lower limiting value of conditional (3) is set to
1.20.In addition, in order to more ensure the effect of acquisition the application, the lower limiting value of conditional (3) is more preferably set to 1.46.
On the other hand, if the value of (- f5)/f3 of the conditional (3) of the varifocal optical system of the application equals or exceeds
The upper limit value of conditional (3), then the focal length of the third lens group become relatively small.This causes to inhibit to give birth in the third lens group
At spherical aberration variation and coma variation, it is thus impossible to realize high optical property.
It may be mentioned that in order to more ensure the effect of acquisition the application, preferably the upper limit value of conditional (3) is set
At 7.50.In order to more ensure to obtain the effect of the application, the upper limit value of conditional (3) is more preferably set to 5.80.
Furthermore it is preferred that the varifocal optical system of the application meets following conditionals (4)：
0.066<R5/f5<0.600 (4)
Wherein, f5 indicates the focal length of the 5th lens group, and R5 indicates in the 5th lens group that surface is towards object side
Spill and the lens surface of its radius of curvature absolute value minimum radius of curvature.
Conditional (4) defines the condition of the variation of the aberration of the varifocal optical system for inhibiting the application.Conditional (4)
In R5 be spill to object side and the radius of curvature that its symbol is negative lens surface.By meeting conditional (4), this
The varifocal optical system of application can inhibit the variation of the astigmatism caused by zoom and the variation of coma, and thus, it is possible to realize high optics
Performance.
If the value of the R5/f5 of the conditional (4) of the varifocal optical system of the application is equal to or is brought down below conditional (4)
Lower limit, become the variation that cannot inhibit the astigmatism caused by zoom, it is thus impossible to obtain high optical property.
It may be mentioned that in order to more ensure the effect of acquisition the application, preferably the lower limiting value of conditional (4) is set to
0.087.In addition, in order to more ensure the effect of the application, the lower limiting value of conditional (4) is more preferably set to 0.098.
On the other hand, if the value of the R5/f5 of the conditional (4) of the varifocal optical system of the application equals or exceeds condition
The upper limit value of formula (4), then the 5th lens group become difficult to the change for the coma for inhibiting to be generated by the third lens group to the 4th lens group
Change the variation with astigmatism, it is thus impossible to realize high optical property.
It may be mentioned that in order to more ensure the effect of the application, the upper limit value of conditional (4) is preferably set to 0.490.
In order to more ensure the effect of the application, the upper limit value of conditional (4) is more preferably set to 0.350.
In the varifocal optical system of the application, preferably the 5th lens group has balsaming lens, and in the 5th lens group
In, the glued surfaces of to be to the spill of object side and the lens surface of its radius of curvature absolute value minimum be balsaming lens.
By this construction, the varifocal optical system of the application can inhibit the coma for making to generate due to the foozle of lens surface inclined
Therefore the heart can realize high optical property.
In addition, in the varifocal optical system of the application, preferably when zooming to telescopic end state from wide-angle side state, the
The distance between three lens groups and the 4th lens group increase from wide-angle side state to middle focal length state, and from middle focal length shape
State reduces to telescopic end state.By this construction, the varifocal optical system of the application can inhibit in the third lens group to the 4th
Therefore the variation of the astigmatism generated at lens group can realize high optical property.
In addition, in the varifocal optical system of the application, preferably telescopic end state is being zoomed to from wide-angle side state
When, the distance between the 4th lens group and the 5th lens group reduce from wide-angle side state to middle focal length state, and from centre
Focal length state increases to telescopic end state.By this construction, the varifocal optical system of the application can inhibit in the 4th lens group
Therefore the variation of the astigmatism generated to the 5th lens group can realize high optical property.
In addition, in the varifocal optical system of the application, it is preferred that zooming to telescopic end state from wide-angle side state
When, integrally move the third lens group and the 5th lens group.By this construction, the zoom of the application can be simplified in structure
The construction of the third lens group and the 5th lens group of optical system, and can inhibit mutually eccentric, therefore, it can realize high optics
Performance.
In addition, in the varifocal optical system of the application, it is preferred that zooming to telescopic end state from wide-angle side state
When, the distance between the first lens group and the second lens group increase, and the distance between the second lens group and the third lens group
Reduce.By this construction, the varifocal optical system of the application can inhibit the spherical aberration generated at each lens group and picture
It dissipates, therefore, when zooming to telescopic end state from wide-angle side state, becomes that the variation of spherical aberration and the change of astigmatism can be inhibited
Change.
In addition, in the varifocal optical system of the application, preferably the 5th lens group has aspherical.Pass through this structure
It makes, the varifocal optical system of the application can inhibit the coma and astigmatism that are generated in the 5th lens group, therefore, can realize high optics
Performance.
In addition, in the varifocal optical system of the application, aspherical in preferably the 5th lens group is most object side surface.
By this construction, the varifocal optical system of the application can inhibit the coma and astigmatism that are generated at the 5th lens group, therefore, energy
Realize high optical property.
Moreover it is preferred that the varifocal optical system of the application has aperture diaphragm in the third lens group or near it.
By this construction, when zooming to telescopic end state from wide-angle side state, the varifocal optical system of the application can inhibit off-axis
Aberration particularly can inhibit the variation of astigmatism.
In addition, in the varifocal optical system of the application, preferably telescopic end state is being zoomed to from wide-angle side state
When, aperture diaphragm is integrally moved together with the third lens group.By this construction, telescopic end is being zoomed to from wide-angle side state
When state, the varifocal optical system of the application can inhibit off-axis aberration, particularly, can inhibit the variation of astigmatism.
The Optical devices of the application are characterized in that equipped with varifocal optical system with above-mentioned construction, hereby it is achieved that
Compact optics with high zoom ratios and high optical system.
Manufacture is characterized in that step according to the method for the varifocal optical system of the application：By the sequence from object side, if
Set the first lens group with positive refractive power, the second lens group with negative refractive power, the third lens group with positive refractive power,
The 4th lens group with negative refractive power and the 5th lens group with negative refractive power, and
It is configured so that when zooming to telescopic end state from wide-angle side state, changes first lens group and institute respectively
State the distance between the distance between second lens group, second lens group and described the third lens group, the third lens
Organize the distance between the distance between described 4th lens group, the 4th lens group and described 5th lens group.Therefore, may be used
To manufacture the mini-focal optical system with high zoom ratios and high optical property.
Hereinafter, by refer to the attached drawing, illustrate varifocal optical system related with the numerical example of the application.
<First example>
Fig. 1 shows the wide-angle side state of the varifocal optical system of the first example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.In Fig. 1, W indicates wide-angle side state；M1 is indicated in first
Between focal length state；M2 indicates the second middle focal length state, and T indicates telescopic end state.In each example described below
In sectional view, they are identical.
The sequence from object side is pressed according to the varifocal optical system of this example, by the first lens group with positive refractive power
G1, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, the with negative refractive power the 4th are thoroughly
Microscope group G4 and the 5th lens group G5 with negative refractive power are constituted.
First lens group G1 presses the sequence from object side along optical axis, by：By that will have the nonreentrant surface towards object side
The balsaming lens of diverging meniscus lens L11 and positive meniscus lens L12 compositions glued together with the nonreentrant surface towards object side,
And the positive meniscus lens L13 with the nonreentrant surface towards object side is constituted.
Second lens group G2 presses the sequence from object side along optical axis, saturating by the negative bent moon with the nonreentrant surface towards object side
Mirror L21, the diverging meniscus lens L22 with the concave surface towards object side, biconvex positive lens L23 and with towards the recessed of object side
The diverging meniscus lens L24 on surface is constituted.Diverging meniscus lens L21 is by its aspherical glass applied in image plane side lens surface
Mold type non-spherical lens.
The third lens group G3 presses the sequence from object side along optical axis, by：By that will have the nonreentrant surface towards object side
Diverging meniscus lens L31 and the balsaming lens of biconvex positive lens L32 compositions glued together, with the nonreentrant surface towards object side
It positive meniscus lens L33 and is glued at the diverging meniscus lens L35 with the concave surface towards object side by biconvex positive lens L34
The balsaming lens constituted together is constituted.Near the object side of the third lens group G3, aperture diaphragm S is set.
4th lens group G4 presses the sequence from object side along optical axis, only by double-concave negative lens L41 and biconvex is just saturating
The balsaming lens of mirror L42 compositions glued together is constituted.Most object side negative lens L41 in 4th lens group G4 is that its is aspherical
It is used in the glass molding type non-spherical lens of object side lens surface.
5th lens group G5 presses the sequence from object side along optical axis, has only by biconvex positive lens L51 to be glued to
The balsaming lens that the diverging meniscus lens L52 of concave surface towards object side is constituted is constituted.It is in the 5th lens group G5, be towards
The lens surface of the spill of object side and its radius of curvature absolute value minimum is between positive lens L51 and diverging meniscus lens L52
Glued surfaces.Positioned at the positive lens L51 of most object side it is that its aspherical is applied to object side lens in 5th lens group G5
The glass molding type non-spherical lens on surface.
In with the varifocal optical system constructed as described above according to this example, zoomed to from wide-angle side state W
When telescopic end state T, the first lens group G1 monotonously shifts to object side, during the second lens group G2 is from wide-angle side state W to first
Between focal length state M1 shift to image side, then, object side is shifted to from the first middle focal length state M1 to telescopic end state T；Third is saturating
Microscope group G3, the 4th lens group G4 and the 5th lens group G5 monotonously shift to object side.At this point, aperture diaphragm S, the third lens group G3
It is integrally moved together with the 5th lens group G5.Therefore, when zooming to telescopic end state T from wide-angle side state W, the first lens
Group the distance between G1 and the second lens group G2 increase, and the distance between the second lens group G2 and the third lens group G3 reduce, the
The distance between three lens group G3 and the 4th lens group G4 increase from wide-angle side state W to the first middle focal length state M1, and
From the first middle focal length state M1 to telescopic end state T reduce, and between the 4th lens group G4 and the 5th lens group G5 away from
Reduce from from wide-angle side state W to the first middle focal length state M1, and from the first middle focal length state M1 to telescopic end state T
Increase.
In table 1, various values related with the varifocal optical system according to this example are listed.
In table 1, f indicates focal length, and Bf indicates back focal length.
In [surface data], m indicates to indicate lens surface by the lens surface number of the sequential counting from object side, r
Radius of curvature, d indicate to next surface distance, nd indicate material d lines (wavelength X=587.6nm) refractive index, and
Abbe number of the ν d expression materials in d lines (wavelength X=587.6nm).OP indicates object plane, and I indicates image plane.
Meanwhile the ∞ in radius of curvature r row indicates flat surface.In refractive index row nd, ignore air nd=1.000000
Refractive index.
In [aspherical surface data], shown by following formula aspherical shown in [surface data]：
X=(h2/r)/[1+[1-κ(h/r)2]1/2]
+A4×h4+A6×h6+A8×h8+A10×h10
Wherein, h indicates that the vertical height from optical axis, x are denoted as at from optical axis vertical height h, along optical axis from aspheric
The section on the vertex in face to aspherical distance sag, κ indicate circular cone coefficient, A4, A6, A8 and A10 indicate asphericity coefficient,
R is denoted as the paraxial curvature radius of the radius of curvature of benchmark spherical surface.“E-n”(n：Integer) indicate " × 10-n", such as
" 1.234E-5 " expression " 1.234 × 10-5”。
In [various data], FNO indicates that F numbers, ω indicate that the half angle of view as unit of spending, Y indicate that image height, TL indicate to become
The total lens length (total lens length) of focus optical system, that is, when focusing in unlimited far object, thoroughly from first
The most object side surface of microscope group G1 is to the distance of image plane I, di (i:Integer) it indicates from the variable distance between the surface on the i-th surface, and
And φ indicates aperture diaphragm diameter.W indicates that wide-angle side state, M1 indicate that the first middle focal length state, M2 indicate burnt among second
Away from state, and T indicates telescopic end state.
In [lens group data], ST indicates the initial sheet of each lens group, that is, the most object side in each lens group
Lens surface.
In [value for being used for conditional], each value relative to conditional is shown.
In the table 1 for various values, " mm " is commonly used in the unit of length, such as focal length f, radius of curvature r etc..So
And since by the proportional optical system for zooming in or out its size, similar optical property can be obtained, therefore, unit is not
It is necessarily limited to " mm ", any other unit appropriate can be used.The explanation of above-mentioned reference mark be in other examples it is identical,
Therefore, by the repetitive description thereof will be omitted.
(table 1) first example
[surface data]
[aspherical surface data]
Surface number：7
Surface number：23
Surface number：26
[various data]
[lens group data]
[value for being used for conditional]
(1) (- f5)/fw=3.532
(2) f5/f4=0.856
(3) (- f5)/f3=2.462
(4) R5/f5=0.158
Fig. 2A and 2B is shown when focusing infinity, according to the varifocal optical system of first example in wide-angle side shape respectively
The figure of various aberrations in state and in the first middle focal length state.
Fig. 3 A and 3B are shown when focusing infinity, according to the varifocal optical system of first example among second respectively
The figure of various aberrations in focal length state and in telescopic end state.
In each figure, FNO indicates f numbers, and A indicates the incidence angle of light (as unit of degree).In each figure, d
Indicate the aberration curve at d lines (wavelength X=587.6nm), and g indicates the aberration at g lines (wavelength X=435.8nm)
Curve.Aberration curve when not having the figure that d or g occurs to indicate d lines.
In the figure for showing astigmatism, solid line indicates sagittal image plane, and dotted line indicates meridian image plane.Related each picture
The above description of poor figure is identical with other examples.
The varifocal optical system according to this example is can be seen that due to from wide-angle side state to telescopic end shape from each figure
The well-corrected of various aberrations in the range of state and excellent optical properties are shown.
<Second example>
Fig. 4 shows the wide-angle side state of the varifocal optical system of the second example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.
The sequence from object side is pressed along optical axis according to the varifocal optical system of this example, thoroughly by with positive refractive power first
Microscope group G1, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, with negative refractive power
Four lens group G4 and the 5th lens group G5 with negative refractive power are constituted.
First lens group G1 presses the sequence from object side along optical axis, by：By negative with the nonreentrant surface towards object side
The balsaming lens of meniscus lens L11 and biconvex positive lens L12 compositions glued together, and with the nonreentrant surface towards object side
Positive meniscus lens L13 constitute.
Second lens group G2 presses the sequence from object side along optical axis, saturating by the negative bent moon with the nonreentrant surface towards object side
Mirror L21, the diverging meniscus lens L22 with the concave surface towards object side, biconvex positive lens L23 and with towards the recessed of object side
The diverging meniscus lens L24 on surface is constituted.Diverging meniscus lens L21 is by the aspherical glass molds applied in image plane side lens surface
Type non-spherical lens processed.
The third lens group G3 presses the sequence from object side along optical axis, by：By negative with the nonreentrant surface towards object side
Meniscus lens L31 and the balsaming lens of biconvex positive lens L32 compositions glued together, with the nonreentrant surface towards object side just
Meniscus lens L33 and by biconvex positive lens L34 and the diverging meniscus lens L35 with the concave surface towards object side is glued together
The balsaming lens of composition is constituted.Near the object side of the third lens group G3, aperture diaphragm S is set.
4th lens group G4 presses the sequence from object side along optical axis, only by double-concave negative lens L41 and biconvex is just saturating
The balsaming lens of mirror L42 compositions glued together is constituted.Most object side negative lens L41 in 4th lens group G4 is that its is aspherical
It is used in the glass molding type non-spherical lens of object side lens surface.
5th lens group G5 presses the sequence from object side along optical axis, by：Positive bent moon with the nonreentrant surface towards object side
Lens L51 and biconvex positive lens L52 and diverging meniscus lens L53 structures glued together with the concave surface towards object side
At balsaming lens constitute.It is in 5th lens group G5, be the spill towards object side and its radius of curvature absolute value is minimum
Lens surface be glued surfaces between positive lens L52 and diverging meniscus lens L53.It is located at most object side in 5th lens group G5
Positive lens L51 be its aspherical glass molding type non-spherical lens for being applied to object side lens surface.
In the varifocal optical system according to this example constructed as described above, dolly-out, dolly-back being zoomed to from wide-angle side state W
When the state T of end, the first lens group G1 monotonously shifts to object side, and centre is burnt from wide-angle side state W to second by the second lens group G2
Image side is shifted to away from state M2, then, object side is shifted to from the second middle focal length state M2 to telescopic end state T；The third lens group
G3, the 4th lens group G4 and the 5th lens group G5 monotonously shift to object side.At this point, aperture diaphragm S, the third lens group G3 and
Five lens group G5 are integrally moved together.Therefore, when zooming to telescopic end state T from wide-angle side state W, the first lens group G1
The distance between second lens group G2 increases, and the distance between the second lens group G2 and the third lens group G3 reduce, and third is saturating
The distance between microscope group G3 and the 4th lens group G4 increase from wide-angle side state W to the second middle focal length state M2, and from the
Two middle focal length state M2 to telescopic end state T reduce, and the distance between the 4th lens group G4 and the 5th lens group G5 from
Wide-angle side state W reduces to the second middle focal length state M2, and increases from the second middle focal length state M2 to telescopic end state T
Add.
In table 2, various values related with the varifocal optical system according to second example are listed.
(table 2) second example
[surface data]
[aspherical surface data]
Surface number：7
Surface number：23
Surface number：26
[various data]
[lens group data]
[value for being used for conditional]
(1) (- f5)/fw=7.479
(2) f5/f4=1.327
(3) (- f5)/f3=4.619
(4) R5/f5=0.106
Fig. 5 A and 5B are to show respectively when focusing infinity, are existed according to the varifocal optical system of the second example of the application
The figure of the various aberrations of state in wide-angle side state and in the first middle focal length.
Fig. 6 A and 6B are to show respectively when focusing infinity, are existed according to the varifocal optical system of the second example of the application
The figure of various aberrations in second middle focal length state and in telescopic end state.
Such as the varifocal optical system according to this example is can be seen that due to from wide-angle side state to telescopic end from each figure
The well-corrected of various aberrations in the range of state and excellent optical properties are shown.
<Third example>
Fig. 7 shows the wide-angle side state of the varifocal optical system of the third example according to the application, the first middle focal length shape
The sectional view of state, the second middle focal length state and telescopic end state.
The sequence from object side is pressed along optical axis according to the varifocal optical system of this example, thoroughly by with positive refractive power first
Microscope group G1, the second lens group G2 with negative refractive power, the third lens group G3 with positive refractive power, with negative refractive power
Four lens group G4, the 5th lens group G5 with negative refractive power and the 6th lens group G6 with positive refractive power are constituted.
First lens group G1 presses the sequence from object side along optical axis, by：By that will have the nonreentrant surface towards object side
The balsaming lens of diverging meniscus lens L11 and biconvex positive lens L12 compositions glued together, and with the convex table towards object side
The positive meniscus lens L13 in face is constituted.
Second lens group G2 presses the sequence from object side along optical axis, saturating by the negative bent moon with the nonreentrant surface towards object side
Mirror L21, the diverging meniscus lens L22 with the concave surface towards object side, biconvex positive lens L23 and with towards the recessed of object side
The diverging meniscus lens L24 on surface is constituted.Diverging meniscus lens L21 is by its aspherical glass applied in image plane side lens surface
Mold type non-spherical lens.
The third lens group G3 presses the sequence from object side along optical axis, by：By that will have the nonreentrant surface towards object side
Diverging meniscus lens L31 and the balsaming lens of biconvex positive lens L32 compositions glued together, with the nonreentrant surface towards object side
Positive meniscus lens L33 and by biconvex positive lens L34 and the diverging meniscus lens L35 with the concave surface towards object side constitutes
Balsaming lens is constituted.In the third lens group G3, aperture diaphragm S is set between positive lens L32 and positive lens L33.
4th lens group G4 presses the sequence from object side along optical axis, only by double-concave negative lens L41 and biconvex is just saturating
The balsaming lens of mirror L42 compositions glued together is constituted.Most object side negative lens L41 in 4th lens group G4 is that its is aspherical
It is used in the glass molding type non-spherical lens of object side lens surface.
5th lens group G5 presses the sequence from object side along optical axis, by：Negative bent moon with the nonreentrant surface towards object side
Lens L51, and by the way that biconvex positive lens L52 and diverging meniscus lens L53 with the concave surface towards object side to be glued at
The balsaming lens constituted together is constituted.It is in 5th lens group G5, be the spill towards object side and its radius of curvature is absolute
The lens surface of value minimum is the glued surfaces between positive lens L52 and diverging meniscus lens L53.It is located at most in 5th lens group G5
The positive lens L51 of object side is its aspherical glass molding type non-spherical lens for being applied to object side lens surface.
6th lens group G6 is only made of the positive meniscus lens L61 with the nonreentrant surface towards object side.
In the varifocal optical system according to this example constructed as described above, dolly-out, dolly-back being zoomed to from wide-angle side state W
When the state T of end, the first lens group G1 monotonously shifts to object side, and centre is burnt from wide-angle side state W to first by the second lens group G2
Image side is shifted to away from state M1, then, object side is shifted to from the first middle focal length state M1 to telescopic end state T；And third is saturating
Microscope group G3, the 4th lens group G4, the 5th lens group G5 and the 6th lens group G6 monotonously shift to object side.At this point, aperture diaphragm
S, the third lens group G3 and the 5th lens group G5 are integrally moved together.Therefore, telescopic end shape is being zoomed to from wide-angle side state W
When state T, the distance between the first lens group G1 and the second lens group G2 increase, between the second lens group G2 and the third lens group G3
Distance reduce, the distance between the third lens group G3 and the 4th lens group G4 are from wide-angle side state W to the second middle focal length shape
State M2 increases, and reduces from the second middle focal length state M2 to telescopic end state T, the 4th lens group G4 and the 5th lens group G5
The distance between reduce from wide-angle side state W to the second middle focal length state M2, and from the second middle focal length state M2 to remote
End state T increases are taken the photograph, and the distance between the 5th lens group G5 and the 6th lens group G6 increases.
In table 3, various values related with the varifocal optical system according to third example are listed.
(table 3) third example
[surface data]
[aspherical surface data]
Surface number：7
Surface number：23
Surface number：26
[various data]
[lens group data]
[value for being used for conditional]
(1) (- f5)/fw=4.915
(2) f5/f4=0.734
(3) (- f5)/f3=3.275
(4) R5/f5=0.158
Fig. 8 A and 8B are shown when focusing infinity, according to the varifocal optical system of third example in wide-angle side shape respectively
The figure of various aberrations in state and in the first middle focal length state.
Fig. 9 A and 9B are shown when focusing infinity, according to the varifocal optical system of third example among second respectively
The figure of various aberrations in focal length state and in telescopic end state.
Such as the varifocal optical system according to this example is can be seen that due to from wide-angle side state to telescopic end from each figure
The well-corrected of various aberrations in the range of state and excellent optical properties are shown.
According to above-mentioned each example, the varifocal optical system with high zoom ratios and excellent optical properties may be implemented.On
State the specific example that example illustrates only the present invention.Therefore, the present invention is not limited to those examples.
In the case where not deteriorating the optical property of varifocal optical system of the application, can suitably use in following
Hold.
The numerical example of varifocal optical system as the application, foregoing illustrates tool, there are five group constructions or six group structures
The optical system made, but the application is not limited to them, but with other constructions, the optical system that such as seven groups construct is also
It is possible.More specifically, lens or lens group can be added to the most object side or most of the varifocal optical system of the application
Image side.It may be mentioned that term " lens group " is used to refer to at least one of the airspace separation by changing when zoom
The part of mirror.
In the varifocal optical system of the application, can by a part for lens group, single lens group it is whole or multiple
Lens group is configured to move in the direction of optical axis as variable focus lens package, to focus on short distance object from unlimited far object
Body.In particular, it is preferred that at least part of the 4th lens group is used as focus lens group.The focus lens group can be used for
Auto-focusing, and be suitable for being driven by the autofocus motor of such as ultrasonic motor.
Can include the movement in the direction of the component of optical axis in the varifocal optical system according to the application
A part for lens group or lens group as damping lens group, or tilts (or swing) in the direction including optical axis, is used for school
Just the image caused by camera shake obscures.In the varifocal optical system according to the application, particularly preferably by the third lens group
At least part be used as damping lens group.
It can be spherical surface, plane or aspherical to constitute according to the lens surface of the lens of the varifocal optical system of the application.
When lens surface is aspherical or plane, lens processing, assembling or adjustment become easy, and can prevent by lens processing,
Optical performance degradation caused by assembling and alignment error, is therefore preferred.In addition, even if surface offsets, optical property it is bad
Change is also small, therefore, and it is preferred.When lens surface is aspherical, can by lapping technique, by mold by glass material
Material is formed as the glass moulding process of aspherical shape or resin material is formed as aspherical shape on glass lens surface
Compound technology, it is aspherical to make.Lens surface can be diffractive optical surfaces, and lens can be graded index
Type lens (GRIN) or plastic lens.
In the varifocal optical system according to the application, preferably between the second lens group and the third lens group, or
Aperture diaphragm is set inside the third lens group, and in the case where being not provided with the component as aperture diaphragm, which can
To be replaced by lens frame.
Anti-reflection coating over a broad range of wavelengths with high-transmission rate can be applied to the zoom light according to the application
Each lens surface of system reduces solar flare or mirage phantom, therefore, can obtain the high optical property with high contrast.
In the varifocal optical system according to the application, zoom ratio is 3 to 20.
It will illustrate equipped with the camera according to the varifocal optical system of the application with reference to figure 10.
Figure 10 is the figure of the construction for the camera for being shown provided with the varifocal optical system of with good grounds the application.
This camera 1 is equipped with the single-lens reflex number as imaging lens 2 according to the varifocal optical system of first example
Code camera.
In this camera, the light sent out from object (not shown) to be captured is assembled by imaging lens 2, anti-by quickly returning
The reflection of mirror 3 is penetrated, and is focused on focusing glass 4.The light focused on focusing glass 4 is reflected repeatedly by pentaprism 5, and is guided
To eyepiece 6.Therefore, photographer can be used as erect image observation object picture by eyepiece.
When photographer presses shutter release button (not shown), quickly returns to mirror 3 and retract from light path, detected by imaging device 7
Light from object (not shown), and capture and be shot image and store it in memory (not shown).With this side
Formula, photographer can shoot the image of object by camera 1.
Herein it should be noted that being mounted on the varifocal optical system according to first example on this camera 1 as imaging lens 2
It is small-sized and there is high zoom ratios and favorable optical performance.Therefore, this camera 1 can be made to be small-sized and pole may be implemented
High optical property, while obtaining high zoom ratios.Equipped with the camera according to above-mentioned second or the varifocal optical system of third example
Effect identical with camera 1 can be executed.Even if without the camera of mirror 3 is quickly returned equipped with the change according to above-mentioned each example
The situation of focus optical system can also obtain effect identical with above-mentioned camera 1.
Finally, it with reference to figure 11, will illustrate the general introduction of the method for the manufacture varifocal optical system according to the application.
Manufacture shown in Figure 11 includes the following steps S1 and S2 according to the method for the varifocal optical system of the application：
Step S1：It is pressed from the sequence of object side setting the first lens group with positive refractive power along optical axis, there is negative dioptric
Second lens group of power, the third lens group with positive refractive power, the 4th lens group with negative refractive power, and bent with negative
5th lens group of luminous power.
Step S2：Well known mobile mechanism is provided so that when zooming to telescopic end state from wide-angle side state, Ke Yifen
Do not change the distance between first lens group and second lens group, second lens group and the third lens group
The distance between, the distance between the third lens group and the 4th lens group and the 4th lens group and described
The distance between five lens groups.
By the method according to the manufacture varifocal optical system of the application, become can to manufacture with high zoom ratios and good
The mini-focal optical system of optical property.
Claims (1)
1. a kind of varifocal optical system presses the sequence from object side along optical axis, including：
First lens group with positive refractive power,
The second lens group with negative refractive power,
The third lens group with positive refractive power, and
The 4th lens group with negative refractive power, and
The 5th lens group with negative refractive power, and
When zooming to telescopic end state from wide-angle side state, change respectively first lens group and second lens group it
Between the distance between distance, second lens group and the third lens group, the third lens group and the described 4th thoroughly
The distance between microscope group and the distance between the 4th lens group and the 5th lens group.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012043840A JP5915261B2 (en) | 2012-02-29 | 2012-02-29 | Variable-magnification optical system, optical device, and variable-magnification optical system manufacturing method |
| JP2012-043840 | 2012-02-29 | ||
| CN201380011477.3A CN104136956B (en) | 2012-02-29 | 2013-02-27 | Varifocal optical system and Optical devices |
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| CN201380011477.3A Division CN104136956B (en) | 2012-02-29 | 2013-02-27 | Varifocal optical system and Optical devices |
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| CN108490592A true CN108490592A (en) | 2018-09-04 |
| CN108490592B CN108490592B (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710665778.8A Active CN107621690B (en) | 2012-02-29 | 2013-02-27 | Zoom optical system |
| CN201380011477.3A Active CN104136956B (en) | 2012-02-29 | 2013-02-27 | Varifocal optical system and Optical devices |
| CN201810153566.6A Active CN108490592B (en) | 2012-02-29 | 2013-02-27 | Zoom optical system |
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| CN201710665778.8A Active CN107621690B (en) | 2012-02-29 | 2013-02-27 | Zoom optical system |
| CN201380011477.3A Active CN104136956B (en) | 2012-02-29 | 2013-02-27 | Varifocal optical system and Optical devices |
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| CN110196484A (en) * | 2019-05-30 | 2019-09-03 | 浙江大华技术股份有限公司 | A kind of camera lens |
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| JP6325772B2 (en) * | 2013-03-29 | 2018-05-16 | キヤノン株式会社 | Imaging lens and imaging apparatus having the same |
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| JP6189637B2 (en) * | 2013-05-22 | 2017-08-30 | 株式会社タムロン | Zoom lens and imaging device |
| JP6064217B2 (en) * | 2013-09-27 | 2017-01-25 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device and camera system |
| JP6325285B2 (en) * | 2014-02-28 | 2018-05-16 | 株式会社タムロン | Inner focus lens |
| JP6325284B2 (en) * | 2014-02-28 | 2018-05-16 | 株式会社タムロン | Inner focus lens |
| JP6536583B2 (en) * | 2014-08-29 | 2019-07-03 | 株式会社ニコン | Variable magnification optical system and optical apparatus |
| CN113741017B (en) * | 2015-12-09 | 2022-12-20 | 株式会社尼康 | Zoom lens and optical apparatus |
| CN107272169B (en) * | 2016-04-06 | 2019-09-24 | 奥林巴斯株式会社 | Varifocal optical system and the photographic device for having the varifocal optical system |
| JP6289533B2 (en) * | 2016-05-02 | 2018-03-07 | 株式会社タムロン | Zoom lens and image pickup apparatus including the same |
| JP6682141B2 (en) * | 2016-08-30 | 2020-04-15 | 富士フイルム株式会社 | Zoom lens, projection display device, and imaging device |
| JP6576381B2 (en) | 2017-03-03 | 2019-09-18 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP6859219B2 (en) * | 2017-07-12 | 2021-04-14 | 株式会社タムロン | Zoom lens and imaging device |
| JP2019028258A (en) * | 2017-07-31 | 2019-02-21 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP7088196B2 (en) * | 2017-09-11 | 2022-06-21 | 株式会社ニコン | Magnification optical system, optical device, and manufacturing method of variable magnification optical system |
| CN114779454B (en) | 2017-09-11 | 2024-04-16 | 株式会社尼康 | Variable magnification optical system and optical device |
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| CN110196484A (en) * | 2019-05-30 | 2019-09-03 | 浙江大华技术股份有限公司 | A kind of camera lens |
| CN110196484B (en) * | 2019-05-30 | 2020-06-23 | 浙江大华技术股份有限公司 | Lens |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013129490A1 (en) | 2013-09-06 |
| JP2013182022A (en) | 2013-09-12 |
| US9684154B2 (en) | 2017-06-20 |
| CN104136956B (en) | 2018-03-27 |
| JP5915261B2 (en) | 2016-05-11 |
| CN104136956A (en) | 2014-11-05 |
| CN107621690A (en) | 2018-01-23 |
| US20140362452A1 (en) | 2014-12-11 |
| CN108490592B (en) | 2021-01-29 |
| CN107621690B (en) | 2020-06-09 |
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